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Definition of achromatic in English:

achromatic

adjective

1Relating to, using, or denoting lenses that transmit light without separating it into constituent colours:

‘achromatic microscopes’

‘a lens of achromatic construction’

‘He also experimented with making an achromatic telescope.’

‘The invention is applicable, in particular, to the production of a main beam with a blurred, achromatic, cut-off at the bottom; this beam may be autonomous, or it may be complementary to a dipped or passing beam.’

‘The system had to be achromatic and diffraction limited for two specific wavelengths spaced about 35 nm apart.’

‘The 'Barlow lens', a modification of this telescope lens, is a negative achromatic combination of flint glass and crown glass.’

‘This behavior is also common in two-material waveplates such as achromatic waveplates constructed from quartz and magnesium fluoride plates.’

‘The modern achromatic compound microscope was invented in 1878, and it was this instrument that added the extra dimension of the microscopic study of tissues to anatomical teaching.’

2literary Without colour:

‘the achromatic gloom’

‘Random branches hung aimlessly above her head and the neighbors' rose bushes stretched thinly across their metal fence like an achromatic spider web.’

‘Hints of desaturated color threaten the pure achromatic palette.’

‘The ocean, also rather achromatic, kissed the foundation of the towering building, spraying up to the pediment.’

‘This stark and achromatic poem is a world away from the graceful and well-tuned lyrics with which Campbell began his career.’

‘Lincoln checked her watch and nodded as an emaciated gray bus spluttered dead; pausing on its way to the ring of featureless, achromatic roads which led to the main structure of South Street ferry port.’